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Realization of Red-Organic-Light Emitting Diode by Introducing the Double Emitting Zone |
| JIANG Wen-Long1,2;HOU Jing-Ying1;ZHAO Yi1;LIU Shi-Yong1 |
| 1National Laboratory of Integrated Optoelectronics, Jilin University, Changchun 130023
2Electronic Information and Engineering Department, Jilin Normal University, Siping 136000 |
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| Cite this article: |
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JIANG Wen-Long, HOU Jing-Ying, ZHAO Yi et al 2003 Chin. Phys. Lett. 20 1861-1863 |
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Abstract A saturated red-organic-light emitting diode (OLED) has been realized by doping an emitting material both in the hole-transporting layer (HTL) and the electron-transporting layer (ETL) to form double emitting zone. The red dopant, 4-(Dicyanomethylene)-2-t-butyl-6-(1,1,7,7-tetramethyljulolidyl-9-enyl)-4H-pyran (DCJTB), was doped into the N,N'-bis-(1-naphthyl)-N,N'-diphenyl-1,1'-biphenyl-4,4'-diamine (NPB) layer and the tris (8-quinolinolate) aluminum (Alq3) layer, both of which act as the emitting layers. The optimal device, with a structure of ITO/CuPc/NPB/NPB:DCJTB/Alq3:DCJTB/Alq3/LiF/Al, showed good chromaticity coordinates (x = 0.63, y = 0.36) at 8 V. Uniquely, the current efficiency of the device was relatively independent of the drive voltage in a wide range from 8 V to 20 V. That may be helpful to ameliorate the lifetime of the organic electroluminescent devices and to adjust the gray-scale for the future full-color display panel.
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| Keywords:
78.60.Fi
78.20.e
78.55.Et
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Published: 01 October 2003
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